<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
    .footer{
        height:300px;
        width:300px;
        background:red;
        margin-top:800px;
    }
</style>
</head>
<body>
    
    <a href="#footer">锚点</a>
    <div class="footer" id="footer"></div>
</body>
</html>